Disk is Cheap, and ILM isn't
The only real use for ILM is in companies that have regulatory requirments to ensure data deletion. I went through an analysis last year using a non-HP ILM product and the bottom line always was it never actually paid for itself against just whacking in a bunch of SATA and SAS disk every 6 months.
Information management and things like dashboards sound good to middle management types, but keeping below their budget sounds a lot better to them.
A proper ILM solution requires quotas, rigid attention to file type control and maybe data fingerprinting. All of this can take a little bit out of the Non-IT employees day (you know..the guys that actually are their to make money for the organistation) so however much the IT managers hat propeller spins at the thought..he's never going to get it past anyone on the money making side with an ounce of sense without a fairly draconian business case or playing the "we don't have a choice" card.